T.Rice all the way for the riding you do. The Banana Magic would be super fun if you love to carve it up as it has a deeper sidecut. T.Rice is stiffer and more damp though.
T.Rice will be best in the pipe as well. Everything you listed, especially considering you won't jib, screams T.Rice to me.
As for extruded vs sintered... Not all bases are created equal. Lib Tech makes great extruded bases, thus they are faster than the average.
Also, granted the slope is steep enough, extruded vs sintered won't really matter. The major difference comes in how they glide, particularly on flats. Extruded flat out (no pun intended) sucks on flatter terrain. Also in powder, sintered just feels better to me between the two when waxed. Might just be in my head though, but just my 2cents.\
And that "happy waxing" comment... YOU BETCHA! It's like yoga for snowboarders. Beer, wax, beer, scrape...
BTW, B.Magic has a more mellow rocker and camber. I like everything about the Magic's shape. Very fun to carve on.